Professional Hidden Embedded Surveillance Cam?

We had great response to our covert camera test including a question today about hidden options to record for a few days. There are many consumer hidden surveillance cameras online, embedded into alarm clocks, motion detectors, teddy bears, etc.

Does anyone know of any high quality, professional level hidden / embedded cameras? What's attractive is the simplicity - just drop it down and let it go. However, the consumer offerings seem to get terrible reviews even from consumers.

Short of building one's own covert system, with pinhole lenses, cables to a dedicated DVR, etc., is there any turnkey hidden / embedded option that is designed for professional use? i.e., Police, corporate, or government investigations?

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